Get an extra water bottle holder so you have plenty for yourself and your dog. Holds most 32 oz sizes of bottled water (bottle not included) or a couple of canned beverages in koozies. Attaches to the opposite side adjustment straps. Vests can actually accommodate two holders on each size if needed.
NOTE: Dove Gear camouflage vest comes with one bottle holder. Bird Gear upland vest comes with two -- one on each side.